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Session Initiation Protocol (SIP) User Agent Configuration
RFC 6011

Internet Engineering Task Force (IETF)                  S. Lawrence, Ed.
Request for Comments: 6011                         Linden Research, Inc.
Category: Informational                                        J. Elwell
ISSN: 2070-1721                        Siemens Enterprise Communications
                                                            October 2010

       Session Initiation Protocol (SIP) User Agent Configuration

Abstract

   This document defines procedures for how a SIP User Agent should
   locate, retrieve, and maintain current configuration information from
   a Configuration Service.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6011.

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Lawrence & Elwell             Informational                     [Page 1]
RFC 6011                  SIP UA Configuration              October 2010

Table of Contents

   1. Introduction ....................................................3
      1.1. Scope ......................................................3
      1.2. Terminology ................................................3
      1.3. User Agent Installation Examples ...........................4
           1.3.1. Hosted IP Service Provider Example ..................5
           1.3.2. IP-PBX Example ......................................5
           1.3.3. Special Considerations for High Security
                  Deployments .........................................6
   2. Obtaining User Agent Configuration ..............................6
      2.1. Network Discovery ..........................................6
           2.1.1. Link Layer Provisioning .............................7
           2.1.2. Network Layer Provisioning ..........................7
      2.2. Obtaining the Configuration Service Domain .................8
           2.2.1. The Local Network Domain ............................8
           2.2.2. Manual Domain Name Entry ............................8
      2.3. Constructing the Configuration Request URL .................8
           2.3.1. Obtaining a Configuration Service Base URL ..........9
           2.3.2. Adding Configuration Request Parameters ............10
           2.3.3. Configuration Request URI Example ..................12
      2.4. Obtaining Configuration from the Configuration Service ....13
           2.4.1. Configuration Data Request Authentication ..........13
           2.4.2. Configuration Data Request Failure .................14
      2.5. Configuration Changes .....................................15
           2.5.1. Configuration Change Subscriptions .................16
           2.5.2. Configuration Change Polling .......................18
      2.6. Validity of Stored Configuration Data .....................19
           2.6.1. Re-Validating Configuration Data ...................19
      2.7. Retry Backoff Procedure ...................................20
   3. Configuration Data .............................................20
      3.1. Configuration Data Items ..................................20
           3.1.1. Address-of-Record ..................................21
           3.1.2. Realm ..............................................21
           3.1.3. Username ...........................................21
           3.1.4. Digest .............................................21
           3.1.5. OutboundProxy ......................................21
      3.2. Reset User Agent to Default Configuration .................21
   4. IANA Considerations ............................................21

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